AH is pretty useless and perhaps should be deprecated

Merike Kaeo kaeo at merike.com
Sat Nov 14 05:09:42 UTC 2009

If I recall correctly what an implementor once told me, the work  
involved in taking the fields that are immutable, then hashing  
packet, then sticking those immutable fields back in is actually more  
work than encrypting.   Surprised me at the time but seems to be the  

- merike

On Nov 13, 2009, at 7:09 PM, sfouant at shortestpathfirst.net wrote:

> I've seen some vendor implementations in which ESP actually  
> outperformed AH during performance testing... go figure...
> Stefan Fouant
> ------Original Message------
> From: Jack Kohn
> To: nanog at nanog.org
> Subject: AH is pretty useless and perhaps should be deprecated
> Sent: Nov 13, 2009 7:22 PM
> Hi,
> Interesting discussion on the utility of Authentication Header (AH) in
> http://www.ietf.org/mail-archive/web/ipsec/current/msg05026.html
> Post explaining that AH even though protecting the source and
> destination IP addresses is really not good enough.
> http://www.ietf.org/mail-archive/web/ipsec/current/msg05056.html
> What do folks feel? Do they see themselves using AH in the future?
> IMO, ESP and WESP are good enough and we dont need to support AH any
> more ..
> Jack
> Sent from my Verizon Wireless BlackBerry

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